1 /* 2 * generic functions used by VFIO devices 3 * 4 * Copyright Red Hat, Inc. 2012 5 * 6 * Authors: 7 * Alex Williamson <alex.williamson@redhat.com> 8 * 9 * This work is licensed under the terms of the GNU GPL, version 2. See 10 * the COPYING file in the top-level directory. 11 * 12 * Based on qemu-kvm device-assignment: 13 * Adapted for KVM by Qumranet. 14 * Copyright (c) 2007, Neocleus, Alex Novik (alex@neocleus.com) 15 * Copyright (c) 2007, Neocleus, Guy Zana (guy@neocleus.com) 16 * Copyright (C) 2008, Qumranet, Amit Shah (amit.shah@qumranet.com) 17 * Copyright (C) 2008, Red Hat, Amit Shah (amit.shah@redhat.com) 18 * Copyright (C) 2008, IBM, Muli Ben-Yehuda (muli@il.ibm.com) 19 */ 20 21 #include "qemu/osdep.h" 22 #include <sys/ioctl.h> 23 #ifdef CONFIG_KVM 24 #include <linux/kvm.h> 25 #endif 26 #include <linux/vfio.h> 27 28 #include "hw/vfio/vfio-common.h" 29 #include "hw/vfio/vfio.h" 30 #include "exec/address-spaces.h" 31 #include "exec/memory.h" 32 #include "exec/ram_addr.h" 33 #include "hw/hw.h" 34 #include "qemu/error-report.h" 35 #include "qemu/main-loop.h" 36 #include "qemu/range.h" 37 #include "sysemu/kvm.h" 38 #include "sysemu/reset.h" 39 #include "trace.h" 40 #include "qapi/error.h" 41 #include "migration/migration.h" 42 43 VFIOGroupList vfio_group_list = 44 QLIST_HEAD_INITIALIZER(vfio_group_list); 45 static QLIST_HEAD(, VFIOAddressSpace) vfio_address_spaces = 46 QLIST_HEAD_INITIALIZER(vfio_address_spaces); 47 48 #ifdef CONFIG_KVM 49 /* 50 * We have a single VFIO pseudo device per KVM VM. Once created it lives 51 * for the life of the VM. Closing the file descriptor only drops our 52 * reference to it and the device's reference to kvm. Therefore once 53 * initialized, this file descriptor is only released on QEMU exit and 54 * we'll re-use it should another vfio device be attached before then. 55 */ 56 static int vfio_kvm_device_fd = -1; 57 #endif 58 59 /* 60 * Common VFIO interrupt disable 61 */ 62 void vfio_disable_irqindex(VFIODevice *vbasedev, int index) 63 { 64 struct vfio_irq_set irq_set = { 65 .argsz = sizeof(irq_set), 66 .flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_TRIGGER, 67 .index = index, 68 .start = 0, 69 .count = 0, 70 }; 71 72 ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, &irq_set); 73 } 74 75 void vfio_unmask_single_irqindex(VFIODevice *vbasedev, int index) 76 { 77 struct vfio_irq_set irq_set = { 78 .argsz = sizeof(irq_set), 79 .flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_UNMASK, 80 .index = index, 81 .start = 0, 82 .count = 1, 83 }; 84 85 ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, &irq_set); 86 } 87 88 void vfio_mask_single_irqindex(VFIODevice *vbasedev, int index) 89 { 90 struct vfio_irq_set irq_set = { 91 .argsz = sizeof(irq_set), 92 .flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_MASK, 93 .index = index, 94 .start = 0, 95 .count = 1, 96 }; 97 98 ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, &irq_set); 99 } 100 101 static inline const char *action_to_str(int action) 102 { 103 switch (action) { 104 case VFIO_IRQ_SET_ACTION_MASK: 105 return "MASK"; 106 case VFIO_IRQ_SET_ACTION_UNMASK: 107 return "UNMASK"; 108 case VFIO_IRQ_SET_ACTION_TRIGGER: 109 return "TRIGGER"; 110 default: 111 return "UNKNOWN ACTION"; 112 } 113 } 114 115 static const char *index_to_str(VFIODevice *vbasedev, int index) 116 { 117 if (vbasedev->type != VFIO_DEVICE_TYPE_PCI) { 118 return NULL; 119 } 120 121 switch (index) { 122 case VFIO_PCI_INTX_IRQ_INDEX: 123 return "INTX"; 124 case VFIO_PCI_MSI_IRQ_INDEX: 125 return "MSI"; 126 case VFIO_PCI_MSIX_IRQ_INDEX: 127 return "MSIX"; 128 case VFIO_PCI_ERR_IRQ_INDEX: 129 return "ERR"; 130 case VFIO_PCI_REQ_IRQ_INDEX: 131 return "REQ"; 132 default: 133 return NULL; 134 } 135 } 136 137 int vfio_set_irq_signaling(VFIODevice *vbasedev, int index, int subindex, 138 int action, int fd, Error **errp) 139 { 140 struct vfio_irq_set *irq_set; 141 int argsz, ret = 0; 142 const char *name; 143 int32_t *pfd; 144 145 argsz = sizeof(*irq_set) + sizeof(*pfd); 146 147 irq_set = g_malloc0(argsz); 148 irq_set->argsz = argsz; 149 irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | action; 150 irq_set->index = index; 151 irq_set->start = subindex; 152 irq_set->count = 1; 153 pfd = (int32_t *)&irq_set->data; 154 *pfd = fd; 155 156 if (ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, irq_set)) { 157 ret = -errno; 158 } 159 g_free(irq_set); 160 161 if (!ret) { 162 return 0; 163 } 164 165 error_setg_errno(errp, -ret, "VFIO_DEVICE_SET_IRQS failure"); 166 167 name = index_to_str(vbasedev, index); 168 if (name) { 169 error_prepend(errp, "%s-%d: ", name, subindex); 170 } else { 171 error_prepend(errp, "index %d-%d: ", index, subindex); 172 } 173 error_prepend(errp, 174 "Failed to %s %s eventfd signaling for interrupt ", 175 fd < 0 ? "tear down" : "set up", action_to_str(action)); 176 return ret; 177 } 178 179 /* 180 * IO Port/MMIO - Beware of the endians, VFIO is always little endian 181 */ 182 void vfio_region_write(void *opaque, hwaddr addr, 183 uint64_t data, unsigned size) 184 { 185 VFIORegion *region = opaque; 186 VFIODevice *vbasedev = region->vbasedev; 187 union { 188 uint8_t byte; 189 uint16_t word; 190 uint32_t dword; 191 uint64_t qword; 192 } buf; 193 194 switch (size) { 195 case 1: 196 buf.byte = data; 197 break; 198 case 2: 199 buf.word = cpu_to_le16(data); 200 break; 201 case 4: 202 buf.dword = cpu_to_le32(data); 203 break; 204 case 8: 205 buf.qword = cpu_to_le64(data); 206 break; 207 default: 208 hw_error("vfio: unsupported write size, %u bytes", size); 209 break; 210 } 211 212 if (pwrite(vbasedev->fd, &buf, size, region->fd_offset + addr) != size) { 213 error_report("%s(%s:region%d+0x%"HWADDR_PRIx", 0x%"PRIx64 214 ",%d) failed: %m", 215 __func__, vbasedev->name, region->nr, 216 addr, data, size); 217 } 218 219 trace_vfio_region_write(vbasedev->name, region->nr, addr, data, size); 220 221 /* 222 * A read or write to a BAR always signals an INTx EOI. This will 223 * do nothing if not pending (including not in INTx mode). We assume 224 * that a BAR access is in response to an interrupt and that BAR 225 * accesses will service the interrupt. Unfortunately, we don't know 226 * which access will service the interrupt, so we're potentially 227 * getting quite a few host interrupts per guest interrupt. 228 */ 229 vbasedev->ops->vfio_eoi(vbasedev); 230 } 231 232 uint64_t vfio_region_read(void *opaque, 233 hwaddr addr, unsigned size) 234 { 235 VFIORegion *region = opaque; 236 VFIODevice *vbasedev = region->vbasedev; 237 union { 238 uint8_t byte; 239 uint16_t word; 240 uint32_t dword; 241 uint64_t qword; 242 } buf; 243 uint64_t data = 0; 244 245 if (pread(vbasedev->fd, &buf, size, region->fd_offset + addr) != size) { 246 error_report("%s(%s:region%d+0x%"HWADDR_PRIx", %d) failed: %m", 247 __func__, vbasedev->name, region->nr, 248 addr, size); 249 return (uint64_t)-1; 250 } 251 switch (size) { 252 case 1: 253 data = buf.byte; 254 break; 255 case 2: 256 data = le16_to_cpu(buf.word); 257 break; 258 case 4: 259 data = le32_to_cpu(buf.dword); 260 break; 261 case 8: 262 data = le64_to_cpu(buf.qword); 263 break; 264 default: 265 hw_error("vfio: unsupported read size, %u bytes", size); 266 break; 267 } 268 269 trace_vfio_region_read(vbasedev->name, region->nr, addr, size, data); 270 271 /* Same as write above */ 272 vbasedev->ops->vfio_eoi(vbasedev); 273 274 return data; 275 } 276 277 const MemoryRegionOps vfio_region_ops = { 278 .read = vfio_region_read, 279 .write = vfio_region_write, 280 .endianness = DEVICE_LITTLE_ENDIAN, 281 .valid = { 282 .min_access_size = 1, 283 .max_access_size = 8, 284 }, 285 .impl = { 286 .min_access_size = 1, 287 .max_access_size = 8, 288 }, 289 }; 290 291 /* 292 * Device state interfaces 293 */ 294 295 bool vfio_mig_active(void) 296 { 297 VFIOGroup *group; 298 VFIODevice *vbasedev; 299 300 if (QLIST_EMPTY(&vfio_group_list)) { 301 return false; 302 } 303 304 QLIST_FOREACH(group, &vfio_group_list, next) { 305 QLIST_FOREACH(vbasedev, &group->device_list, next) { 306 if (vbasedev->migration_blocker) { 307 return false; 308 } 309 } 310 } 311 return true; 312 } 313 314 static bool vfio_devices_all_stopped_and_saving(VFIOContainer *container) 315 { 316 VFIOGroup *group; 317 VFIODevice *vbasedev; 318 MigrationState *ms = migrate_get_current(); 319 320 if (!migration_is_setup_or_active(ms->state)) { 321 return false; 322 } 323 324 QLIST_FOREACH(group, &container->group_list, container_next) { 325 QLIST_FOREACH(vbasedev, &group->device_list, next) { 326 VFIOMigration *migration = vbasedev->migration; 327 328 if (!migration) { 329 return false; 330 } 331 332 if ((migration->device_state & VFIO_DEVICE_STATE_SAVING) && 333 !(migration->device_state & VFIO_DEVICE_STATE_RUNNING)) { 334 continue; 335 } else { 336 return false; 337 } 338 } 339 } 340 return true; 341 } 342 343 static bool vfio_devices_all_running_and_saving(VFIOContainer *container) 344 { 345 VFIOGroup *group; 346 VFIODevice *vbasedev; 347 MigrationState *ms = migrate_get_current(); 348 349 if (!migration_is_setup_or_active(ms->state)) { 350 return false; 351 } 352 353 QLIST_FOREACH(group, &container->group_list, container_next) { 354 QLIST_FOREACH(vbasedev, &group->device_list, next) { 355 VFIOMigration *migration = vbasedev->migration; 356 357 if (!migration) { 358 return false; 359 } 360 361 if ((migration->device_state & VFIO_DEVICE_STATE_SAVING) && 362 (migration->device_state & VFIO_DEVICE_STATE_RUNNING)) { 363 continue; 364 } else { 365 return false; 366 } 367 } 368 } 369 return true; 370 } 371 372 static int vfio_dma_unmap_bitmap(VFIOContainer *container, 373 hwaddr iova, ram_addr_t size, 374 IOMMUTLBEntry *iotlb) 375 { 376 struct vfio_iommu_type1_dma_unmap *unmap; 377 struct vfio_bitmap *bitmap; 378 uint64_t pages = TARGET_PAGE_ALIGN(size) >> TARGET_PAGE_BITS; 379 int ret; 380 381 unmap = g_malloc0(sizeof(*unmap) + sizeof(*bitmap)); 382 383 unmap->argsz = sizeof(*unmap) + sizeof(*bitmap); 384 unmap->iova = iova; 385 unmap->size = size; 386 unmap->flags |= VFIO_DMA_UNMAP_FLAG_GET_DIRTY_BITMAP; 387 bitmap = (struct vfio_bitmap *)&unmap->data; 388 389 /* 390 * cpu_physical_memory_set_dirty_lebitmap() expects pages in bitmap of 391 * TARGET_PAGE_SIZE to mark those dirty. Hence set bitmap_pgsize to 392 * TARGET_PAGE_SIZE. 393 */ 394 395 bitmap->pgsize = TARGET_PAGE_SIZE; 396 bitmap->size = ROUND_UP(pages, sizeof(__u64) * BITS_PER_BYTE) / 397 BITS_PER_BYTE; 398 399 if (bitmap->size > container->max_dirty_bitmap_size) { 400 error_report("UNMAP: Size of bitmap too big 0x%"PRIx64, 401 (uint64_t)bitmap->size); 402 ret = -E2BIG; 403 goto unmap_exit; 404 } 405 406 bitmap->data = g_try_malloc0(bitmap->size); 407 if (!bitmap->data) { 408 ret = -ENOMEM; 409 goto unmap_exit; 410 } 411 412 ret = ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, unmap); 413 if (!ret) { 414 cpu_physical_memory_set_dirty_lebitmap((unsigned long *)bitmap->data, 415 iotlb->translated_addr, pages); 416 } else { 417 error_report("VFIO_UNMAP_DMA with DIRTY_BITMAP : %m"); 418 } 419 420 g_free(bitmap->data); 421 unmap_exit: 422 g_free(unmap); 423 return ret; 424 } 425 426 /* 427 * DMA - Mapping and unmapping for the "type1" IOMMU interface used on x86 428 */ 429 static int vfio_dma_unmap(VFIOContainer *container, 430 hwaddr iova, ram_addr_t size, 431 IOMMUTLBEntry *iotlb) 432 { 433 struct vfio_iommu_type1_dma_unmap unmap = { 434 .argsz = sizeof(unmap), 435 .flags = 0, 436 .iova = iova, 437 .size = size, 438 }; 439 440 if (iotlb && container->dirty_pages_supported && 441 vfio_devices_all_running_and_saving(container)) { 442 return vfio_dma_unmap_bitmap(container, iova, size, iotlb); 443 } 444 445 while (ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, &unmap)) { 446 /* 447 * The type1 backend has an off-by-one bug in the kernel (71a7d3d78e3c 448 * v4.15) where an overflow in its wrap-around check prevents us from 449 * unmapping the last page of the address space. Test for the error 450 * condition and re-try the unmap excluding the last page. The 451 * expectation is that we've never mapped the last page anyway and this 452 * unmap request comes via vIOMMU support which also makes it unlikely 453 * that this page is used. This bug was introduced well after type1 v2 454 * support was introduced, so we shouldn't need to test for v1. A fix 455 * is queued for kernel v5.0 so this workaround can be removed once 456 * affected kernels are sufficiently deprecated. 457 */ 458 if (errno == EINVAL && unmap.size && !(unmap.iova + unmap.size) && 459 container->iommu_type == VFIO_TYPE1v2_IOMMU) { 460 trace_vfio_dma_unmap_overflow_workaround(); 461 unmap.size -= 1ULL << ctz64(container->pgsizes); 462 continue; 463 } 464 error_report("VFIO_UNMAP_DMA failed: %s", strerror(errno)); 465 return -errno; 466 } 467 468 return 0; 469 } 470 471 static int vfio_dma_map(VFIOContainer *container, hwaddr iova, 472 ram_addr_t size, void *vaddr, bool readonly) 473 { 474 struct vfio_iommu_type1_dma_map map = { 475 .argsz = sizeof(map), 476 .flags = VFIO_DMA_MAP_FLAG_READ, 477 .vaddr = (__u64)(uintptr_t)vaddr, 478 .iova = iova, 479 .size = size, 480 }; 481 482 if (!readonly) { 483 map.flags |= VFIO_DMA_MAP_FLAG_WRITE; 484 } 485 486 /* 487 * Try the mapping, if it fails with EBUSY, unmap the region and try 488 * again. This shouldn't be necessary, but we sometimes see it in 489 * the VGA ROM space. 490 */ 491 if (ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0 || 492 (errno == EBUSY && vfio_dma_unmap(container, iova, size, NULL) == 0 && 493 ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0)) { 494 return 0; 495 } 496 497 error_report("VFIO_MAP_DMA failed: %s", strerror(errno)); 498 return -errno; 499 } 500 501 static void vfio_host_win_add(VFIOContainer *container, 502 hwaddr min_iova, hwaddr max_iova, 503 uint64_t iova_pgsizes) 504 { 505 VFIOHostDMAWindow *hostwin; 506 507 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { 508 if (ranges_overlap(hostwin->min_iova, 509 hostwin->max_iova - hostwin->min_iova + 1, 510 min_iova, 511 max_iova - min_iova + 1)) { 512 hw_error("%s: Overlapped IOMMU are not enabled", __func__); 513 } 514 } 515 516 hostwin = g_malloc0(sizeof(*hostwin)); 517 518 hostwin->min_iova = min_iova; 519 hostwin->max_iova = max_iova; 520 hostwin->iova_pgsizes = iova_pgsizes; 521 QLIST_INSERT_HEAD(&container->hostwin_list, hostwin, hostwin_next); 522 } 523 524 static int vfio_host_win_del(VFIOContainer *container, hwaddr min_iova, 525 hwaddr max_iova) 526 { 527 VFIOHostDMAWindow *hostwin; 528 529 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { 530 if (hostwin->min_iova == min_iova && hostwin->max_iova == max_iova) { 531 QLIST_REMOVE(hostwin, hostwin_next); 532 return 0; 533 } 534 } 535 536 return -1; 537 } 538 539 static bool vfio_listener_skipped_section(MemoryRegionSection *section) 540 { 541 return (!memory_region_is_ram(section->mr) && 542 !memory_region_is_iommu(section->mr)) || 543 /* 544 * Sizing an enabled 64-bit BAR can cause spurious mappings to 545 * addresses in the upper part of the 64-bit address space. These 546 * are never accessed by the CPU and beyond the address width of 547 * some IOMMU hardware. TODO: VFIO should tell us the IOMMU width. 548 */ 549 section->offset_within_address_space & (1ULL << 63); 550 } 551 552 /* Called with rcu_read_lock held. */ 553 static bool vfio_get_xlat_addr(IOMMUTLBEntry *iotlb, void **vaddr, 554 ram_addr_t *ram_addr, bool *read_only) 555 { 556 MemoryRegion *mr; 557 hwaddr xlat; 558 hwaddr len = iotlb->addr_mask + 1; 559 bool writable = iotlb->perm & IOMMU_WO; 560 561 /* 562 * The IOMMU TLB entry we have just covers translation through 563 * this IOMMU to its immediate target. We need to translate 564 * it the rest of the way through to memory. 565 */ 566 mr = address_space_translate(&address_space_memory, 567 iotlb->translated_addr, 568 &xlat, &len, writable, 569 MEMTXATTRS_UNSPECIFIED); 570 if (!memory_region_is_ram(mr)) { 571 error_report("iommu map to non memory area %"HWADDR_PRIx"", 572 xlat); 573 return false; 574 } 575 576 /* 577 * Translation truncates length to the IOMMU page size, 578 * check that it did not truncate too much. 579 */ 580 if (len & iotlb->addr_mask) { 581 error_report("iommu has granularity incompatible with target AS"); 582 return false; 583 } 584 585 if (vaddr) { 586 *vaddr = memory_region_get_ram_ptr(mr) + xlat; 587 } 588 589 if (ram_addr) { 590 *ram_addr = memory_region_get_ram_addr(mr) + xlat; 591 } 592 593 if (read_only) { 594 *read_only = !writable || mr->readonly; 595 } 596 597 return true; 598 } 599 600 static void vfio_iommu_map_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb) 601 { 602 VFIOGuestIOMMU *giommu = container_of(n, VFIOGuestIOMMU, n); 603 VFIOContainer *container = giommu->container; 604 hwaddr iova = iotlb->iova + giommu->iommu_offset; 605 void *vaddr; 606 int ret; 607 608 trace_vfio_iommu_map_notify(iotlb->perm == IOMMU_NONE ? "UNMAP" : "MAP", 609 iova, iova + iotlb->addr_mask); 610 611 if (iotlb->target_as != &address_space_memory) { 612 error_report("Wrong target AS \"%s\", only system memory is allowed", 613 iotlb->target_as->name ? iotlb->target_as->name : "none"); 614 return; 615 } 616 617 rcu_read_lock(); 618 619 if ((iotlb->perm & IOMMU_RW) != IOMMU_NONE) { 620 bool read_only; 621 622 if (!vfio_get_xlat_addr(iotlb, &vaddr, NULL, &read_only)) { 623 goto out; 624 } 625 /* 626 * vaddr is only valid until rcu_read_unlock(). But after 627 * vfio_dma_map has set up the mapping the pages will be 628 * pinned by the kernel. This makes sure that the RAM backend 629 * of vaddr will always be there, even if the memory object is 630 * destroyed and its backing memory munmap-ed. 631 */ 632 ret = vfio_dma_map(container, iova, 633 iotlb->addr_mask + 1, vaddr, 634 read_only); 635 if (ret) { 636 error_report("vfio_dma_map(%p, 0x%"HWADDR_PRIx", " 637 "0x%"HWADDR_PRIx", %p) = %d (%m)", 638 container, iova, 639 iotlb->addr_mask + 1, vaddr, ret); 640 } 641 } else { 642 ret = vfio_dma_unmap(container, iova, iotlb->addr_mask + 1, iotlb); 643 if (ret) { 644 error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", " 645 "0x%"HWADDR_PRIx") = %d (%m)", 646 container, iova, 647 iotlb->addr_mask + 1, ret); 648 } 649 } 650 out: 651 rcu_read_unlock(); 652 } 653 654 static void vfio_listener_region_add(MemoryListener *listener, 655 MemoryRegionSection *section) 656 { 657 VFIOContainer *container = container_of(listener, VFIOContainer, listener); 658 hwaddr iova, end; 659 Int128 llend, llsize; 660 void *vaddr; 661 int ret; 662 VFIOHostDMAWindow *hostwin; 663 bool hostwin_found; 664 Error *err = NULL; 665 666 if (vfio_listener_skipped_section(section)) { 667 trace_vfio_listener_region_add_skip( 668 section->offset_within_address_space, 669 section->offset_within_address_space + 670 int128_get64(int128_sub(section->size, int128_one()))); 671 return; 672 } 673 674 if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK) != 675 (section->offset_within_region & ~TARGET_PAGE_MASK))) { 676 error_report("%s received unaligned region", __func__); 677 return; 678 } 679 680 iova = TARGET_PAGE_ALIGN(section->offset_within_address_space); 681 llend = int128_make64(section->offset_within_address_space); 682 llend = int128_add(llend, section->size); 683 llend = int128_and(llend, int128_exts64(TARGET_PAGE_MASK)); 684 685 if (int128_ge(int128_make64(iova), llend)) { 686 return; 687 } 688 end = int128_get64(int128_sub(llend, int128_one())); 689 690 if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) { 691 hwaddr pgsize = 0; 692 693 /* For now intersections are not allowed, we may relax this later */ 694 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { 695 if (ranges_overlap(hostwin->min_iova, 696 hostwin->max_iova - hostwin->min_iova + 1, 697 section->offset_within_address_space, 698 int128_get64(section->size))) { 699 error_setg(&err, 700 "region [0x%"PRIx64",0x%"PRIx64"] overlaps with existing" 701 "host DMA window [0x%"PRIx64",0x%"PRIx64"]", 702 section->offset_within_address_space, 703 section->offset_within_address_space + 704 int128_get64(section->size) - 1, 705 hostwin->min_iova, hostwin->max_iova); 706 goto fail; 707 } 708 } 709 710 ret = vfio_spapr_create_window(container, section, &pgsize); 711 if (ret) { 712 error_setg_errno(&err, -ret, "Failed to create SPAPR window"); 713 goto fail; 714 } 715 716 vfio_host_win_add(container, section->offset_within_address_space, 717 section->offset_within_address_space + 718 int128_get64(section->size) - 1, pgsize); 719 #ifdef CONFIG_KVM 720 if (kvm_enabled()) { 721 VFIOGroup *group; 722 IOMMUMemoryRegion *iommu_mr = IOMMU_MEMORY_REGION(section->mr); 723 struct kvm_vfio_spapr_tce param; 724 struct kvm_device_attr attr = { 725 .group = KVM_DEV_VFIO_GROUP, 726 .attr = KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE, 727 .addr = (uint64_t)(unsigned long)¶m, 728 }; 729 730 if (!memory_region_iommu_get_attr(iommu_mr, IOMMU_ATTR_SPAPR_TCE_FD, 731 ¶m.tablefd)) { 732 QLIST_FOREACH(group, &container->group_list, container_next) { 733 param.groupfd = group->fd; 734 if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) { 735 error_report("vfio: failed to setup fd %d " 736 "for a group with fd %d: %s", 737 param.tablefd, param.groupfd, 738 strerror(errno)); 739 return; 740 } 741 trace_vfio_spapr_group_attach(param.groupfd, param.tablefd); 742 } 743 } 744 } 745 #endif 746 } 747 748 hostwin_found = false; 749 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { 750 if (hostwin->min_iova <= iova && end <= hostwin->max_iova) { 751 hostwin_found = true; 752 break; 753 } 754 } 755 756 if (!hostwin_found) { 757 error_setg(&err, "Container %p can't map guest IOVA region" 758 " 0x%"HWADDR_PRIx"..0x%"HWADDR_PRIx, container, iova, end); 759 goto fail; 760 } 761 762 memory_region_ref(section->mr); 763 764 if (memory_region_is_iommu(section->mr)) { 765 VFIOGuestIOMMU *giommu; 766 IOMMUMemoryRegion *iommu_mr = IOMMU_MEMORY_REGION(section->mr); 767 int iommu_idx; 768 769 trace_vfio_listener_region_add_iommu(iova, end); 770 /* 771 * FIXME: For VFIO iommu types which have KVM acceleration to 772 * avoid bouncing all map/unmaps through qemu this way, this 773 * would be the right place to wire that up (tell the KVM 774 * device emulation the VFIO iommu handles to use). 775 */ 776 giommu = g_malloc0(sizeof(*giommu)); 777 giommu->iommu = iommu_mr; 778 giommu->iommu_offset = section->offset_within_address_space - 779 section->offset_within_region; 780 giommu->container = container; 781 llend = int128_add(int128_make64(section->offset_within_region), 782 section->size); 783 llend = int128_sub(llend, int128_one()); 784 iommu_idx = memory_region_iommu_attrs_to_index(iommu_mr, 785 MEMTXATTRS_UNSPECIFIED); 786 iommu_notifier_init(&giommu->n, vfio_iommu_map_notify, 787 IOMMU_NOTIFIER_ALL, 788 section->offset_within_region, 789 int128_get64(llend), 790 iommu_idx); 791 792 ret = memory_region_iommu_set_page_size_mask(giommu->iommu, 793 container->pgsizes, 794 &err); 795 if (ret) { 796 g_free(giommu); 797 goto fail; 798 } 799 800 ret = memory_region_register_iommu_notifier(section->mr, &giommu->n, 801 &err); 802 if (ret) { 803 g_free(giommu); 804 goto fail; 805 } 806 QLIST_INSERT_HEAD(&container->giommu_list, giommu, giommu_next); 807 memory_region_iommu_replay(giommu->iommu, &giommu->n); 808 809 return; 810 } 811 812 /* Here we assume that memory_region_is_ram(section->mr)==true */ 813 814 vaddr = memory_region_get_ram_ptr(section->mr) + 815 section->offset_within_region + 816 (iova - section->offset_within_address_space); 817 818 trace_vfio_listener_region_add_ram(iova, end, vaddr); 819 820 llsize = int128_sub(llend, int128_make64(iova)); 821 822 if (memory_region_is_ram_device(section->mr)) { 823 hwaddr pgmask = (1ULL << ctz64(hostwin->iova_pgsizes)) - 1; 824 825 if ((iova & pgmask) || (int128_get64(llsize) & pgmask)) { 826 trace_vfio_listener_region_add_no_dma_map( 827 memory_region_name(section->mr), 828 section->offset_within_address_space, 829 int128_getlo(section->size), 830 pgmask + 1); 831 return; 832 } 833 } 834 835 ret = vfio_dma_map(container, iova, int128_get64(llsize), 836 vaddr, section->readonly); 837 if (ret) { 838 error_setg(&err, "vfio_dma_map(%p, 0x%"HWADDR_PRIx", " 839 "0x%"HWADDR_PRIx", %p) = %d (%m)", 840 container, iova, int128_get64(llsize), vaddr, ret); 841 if (memory_region_is_ram_device(section->mr)) { 842 /* Allow unexpected mappings not to be fatal for RAM devices */ 843 error_report_err(err); 844 return; 845 } 846 goto fail; 847 } 848 849 return; 850 851 fail: 852 if (memory_region_is_ram_device(section->mr)) { 853 error_report("failed to vfio_dma_map. pci p2p may not work"); 854 return; 855 } 856 /* 857 * On the initfn path, store the first error in the container so we 858 * can gracefully fail. Runtime, there's not much we can do other 859 * than throw a hardware error. 860 */ 861 if (!container->initialized) { 862 if (!container->error) { 863 error_propagate_prepend(&container->error, err, 864 "Region %s: ", 865 memory_region_name(section->mr)); 866 } else { 867 error_free(err); 868 } 869 } else { 870 error_report_err(err); 871 hw_error("vfio: DMA mapping failed, unable to continue"); 872 } 873 } 874 875 static void vfio_listener_region_del(MemoryListener *listener, 876 MemoryRegionSection *section) 877 { 878 VFIOContainer *container = container_of(listener, VFIOContainer, listener); 879 hwaddr iova, end; 880 Int128 llend, llsize; 881 int ret; 882 bool try_unmap = true; 883 884 if (vfio_listener_skipped_section(section)) { 885 trace_vfio_listener_region_del_skip( 886 section->offset_within_address_space, 887 section->offset_within_address_space + 888 int128_get64(int128_sub(section->size, int128_one()))); 889 return; 890 } 891 892 if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK) != 893 (section->offset_within_region & ~TARGET_PAGE_MASK))) { 894 error_report("%s received unaligned region", __func__); 895 return; 896 } 897 898 if (memory_region_is_iommu(section->mr)) { 899 VFIOGuestIOMMU *giommu; 900 901 QLIST_FOREACH(giommu, &container->giommu_list, giommu_next) { 902 if (MEMORY_REGION(giommu->iommu) == section->mr && 903 giommu->n.start == section->offset_within_region) { 904 memory_region_unregister_iommu_notifier(section->mr, 905 &giommu->n); 906 QLIST_REMOVE(giommu, giommu_next); 907 g_free(giommu); 908 break; 909 } 910 } 911 912 /* 913 * FIXME: We assume the one big unmap below is adequate to 914 * remove any individual page mappings in the IOMMU which 915 * might have been copied into VFIO. This works for a page table 916 * based IOMMU where a big unmap flattens a large range of IO-PTEs. 917 * That may not be true for all IOMMU types. 918 */ 919 } 920 921 iova = TARGET_PAGE_ALIGN(section->offset_within_address_space); 922 llend = int128_make64(section->offset_within_address_space); 923 llend = int128_add(llend, section->size); 924 llend = int128_and(llend, int128_exts64(TARGET_PAGE_MASK)); 925 926 if (int128_ge(int128_make64(iova), llend)) { 927 return; 928 } 929 end = int128_get64(int128_sub(llend, int128_one())); 930 931 llsize = int128_sub(llend, int128_make64(iova)); 932 933 trace_vfio_listener_region_del(iova, end); 934 935 if (memory_region_is_ram_device(section->mr)) { 936 hwaddr pgmask; 937 VFIOHostDMAWindow *hostwin; 938 bool hostwin_found = false; 939 940 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { 941 if (hostwin->min_iova <= iova && end <= hostwin->max_iova) { 942 hostwin_found = true; 943 break; 944 } 945 } 946 assert(hostwin_found); /* or region_add() would have failed */ 947 948 pgmask = (1ULL << ctz64(hostwin->iova_pgsizes)) - 1; 949 try_unmap = !((iova & pgmask) || (int128_get64(llsize) & pgmask)); 950 } 951 952 if (try_unmap) { 953 if (int128_eq(llsize, int128_2_64())) { 954 /* The unmap ioctl doesn't accept a full 64-bit span. */ 955 llsize = int128_rshift(llsize, 1); 956 ret = vfio_dma_unmap(container, iova, int128_get64(llsize), NULL); 957 if (ret) { 958 error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", " 959 "0x%"HWADDR_PRIx") = %d (%m)", 960 container, iova, int128_get64(llsize), ret); 961 } 962 iova += int128_get64(llsize); 963 } 964 ret = vfio_dma_unmap(container, iova, int128_get64(llsize), NULL); 965 if (ret) { 966 error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", " 967 "0x%"HWADDR_PRIx") = %d (%m)", 968 container, iova, int128_get64(llsize), ret); 969 } 970 } 971 972 memory_region_unref(section->mr); 973 974 if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) { 975 vfio_spapr_remove_window(container, 976 section->offset_within_address_space); 977 if (vfio_host_win_del(container, 978 section->offset_within_address_space, 979 section->offset_within_address_space + 980 int128_get64(section->size) - 1) < 0) { 981 hw_error("%s: Cannot delete missing window at %"HWADDR_PRIx, 982 __func__, section->offset_within_address_space); 983 } 984 } 985 } 986 987 static int vfio_get_dirty_bitmap(VFIOContainer *container, uint64_t iova, 988 uint64_t size, ram_addr_t ram_addr) 989 { 990 struct vfio_iommu_type1_dirty_bitmap *dbitmap; 991 struct vfio_iommu_type1_dirty_bitmap_get *range; 992 uint64_t pages; 993 int ret; 994 995 dbitmap = g_malloc0(sizeof(*dbitmap) + sizeof(*range)); 996 997 dbitmap->argsz = sizeof(*dbitmap) + sizeof(*range); 998 dbitmap->flags = VFIO_IOMMU_DIRTY_PAGES_FLAG_GET_BITMAP; 999 range = (struct vfio_iommu_type1_dirty_bitmap_get *)&dbitmap->data; 1000 range->iova = iova; 1001 range->size = size; 1002 1003 /* 1004 * cpu_physical_memory_set_dirty_lebitmap() expects pages in bitmap of 1005 * TARGET_PAGE_SIZE to mark those dirty. Hence set bitmap's pgsize to 1006 * TARGET_PAGE_SIZE. 1007 */ 1008 range->bitmap.pgsize = TARGET_PAGE_SIZE; 1009 1010 pages = TARGET_PAGE_ALIGN(range->size) >> TARGET_PAGE_BITS; 1011 range->bitmap.size = ROUND_UP(pages, sizeof(__u64) * BITS_PER_BYTE) / 1012 BITS_PER_BYTE; 1013 range->bitmap.data = g_try_malloc0(range->bitmap.size); 1014 if (!range->bitmap.data) { 1015 ret = -ENOMEM; 1016 goto err_out; 1017 } 1018 1019 ret = ioctl(container->fd, VFIO_IOMMU_DIRTY_PAGES, dbitmap); 1020 if (ret) { 1021 error_report("Failed to get dirty bitmap for iova: 0x%"PRIx64 1022 " size: 0x%"PRIx64" err: %d", (uint64_t)range->iova, 1023 (uint64_t)range->size, errno); 1024 goto err_out; 1025 } 1026 1027 cpu_physical_memory_set_dirty_lebitmap((unsigned long *)range->bitmap.data, 1028 ram_addr, pages); 1029 1030 trace_vfio_get_dirty_bitmap(container->fd, range->iova, range->size, 1031 range->bitmap.size, ram_addr); 1032 err_out: 1033 g_free(range->bitmap.data); 1034 g_free(dbitmap); 1035 1036 return ret; 1037 } 1038 1039 typedef struct { 1040 IOMMUNotifier n; 1041 VFIOGuestIOMMU *giommu; 1042 } vfio_giommu_dirty_notifier; 1043 1044 static void vfio_iommu_map_dirty_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb) 1045 { 1046 vfio_giommu_dirty_notifier *gdn = container_of(n, 1047 vfio_giommu_dirty_notifier, n); 1048 VFIOGuestIOMMU *giommu = gdn->giommu; 1049 VFIOContainer *container = giommu->container; 1050 hwaddr iova = iotlb->iova + giommu->iommu_offset; 1051 ram_addr_t translated_addr; 1052 1053 trace_vfio_iommu_map_dirty_notify(iova, iova + iotlb->addr_mask); 1054 1055 if (iotlb->target_as != &address_space_memory) { 1056 error_report("Wrong target AS \"%s\", only system memory is allowed", 1057 iotlb->target_as->name ? iotlb->target_as->name : "none"); 1058 return; 1059 } 1060 1061 rcu_read_lock(); 1062 if (vfio_get_xlat_addr(iotlb, NULL, &translated_addr, NULL)) { 1063 int ret; 1064 1065 ret = vfio_get_dirty_bitmap(container, iova, iotlb->addr_mask + 1, 1066 translated_addr); 1067 if (ret) { 1068 error_report("vfio_iommu_map_dirty_notify(%p, 0x%"HWADDR_PRIx", " 1069 "0x%"HWADDR_PRIx") = %d (%m)", 1070 container, iova, 1071 iotlb->addr_mask + 1, ret); 1072 } 1073 } 1074 rcu_read_unlock(); 1075 } 1076 1077 static int vfio_sync_dirty_bitmap(VFIOContainer *container, 1078 MemoryRegionSection *section) 1079 { 1080 ram_addr_t ram_addr; 1081 1082 if (memory_region_is_iommu(section->mr)) { 1083 VFIOGuestIOMMU *giommu; 1084 1085 QLIST_FOREACH(giommu, &container->giommu_list, giommu_next) { 1086 if (MEMORY_REGION(giommu->iommu) == section->mr && 1087 giommu->n.start == section->offset_within_region) { 1088 Int128 llend; 1089 vfio_giommu_dirty_notifier gdn = { .giommu = giommu }; 1090 int idx = memory_region_iommu_attrs_to_index(giommu->iommu, 1091 MEMTXATTRS_UNSPECIFIED); 1092 1093 llend = int128_add(int128_make64(section->offset_within_region), 1094 section->size); 1095 llend = int128_sub(llend, int128_one()); 1096 1097 iommu_notifier_init(&gdn.n, 1098 vfio_iommu_map_dirty_notify, 1099 IOMMU_NOTIFIER_MAP, 1100 section->offset_within_region, 1101 int128_get64(llend), 1102 idx); 1103 memory_region_iommu_replay(giommu->iommu, &gdn.n); 1104 break; 1105 } 1106 } 1107 return 0; 1108 } 1109 1110 ram_addr = memory_region_get_ram_addr(section->mr) + 1111 section->offset_within_region; 1112 1113 return vfio_get_dirty_bitmap(container, 1114 TARGET_PAGE_ALIGN(section->offset_within_address_space), 1115 int128_get64(section->size), ram_addr); 1116 } 1117 1118 static void vfio_listerner_log_sync(MemoryListener *listener, 1119 MemoryRegionSection *section) 1120 { 1121 VFIOContainer *container = container_of(listener, VFIOContainer, listener); 1122 1123 if (vfio_listener_skipped_section(section) || 1124 !container->dirty_pages_supported) { 1125 return; 1126 } 1127 1128 if (vfio_devices_all_stopped_and_saving(container)) { 1129 vfio_sync_dirty_bitmap(container, section); 1130 } 1131 } 1132 1133 static const MemoryListener vfio_memory_listener = { 1134 .region_add = vfio_listener_region_add, 1135 .region_del = vfio_listener_region_del, 1136 .log_sync = vfio_listerner_log_sync, 1137 }; 1138 1139 static void vfio_listener_release(VFIOContainer *container) 1140 { 1141 memory_listener_unregister(&container->listener); 1142 if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) { 1143 memory_listener_unregister(&container->prereg_listener); 1144 } 1145 } 1146 1147 static struct vfio_info_cap_header * 1148 vfio_get_cap(void *ptr, uint32_t cap_offset, uint16_t id) 1149 { 1150 struct vfio_info_cap_header *hdr; 1151 1152 for (hdr = ptr + cap_offset; hdr != ptr; hdr = ptr + hdr->next) { 1153 if (hdr->id == id) { 1154 return hdr; 1155 } 1156 } 1157 1158 return NULL; 1159 } 1160 1161 struct vfio_info_cap_header * 1162 vfio_get_region_info_cap(struct vfio_region_info *info, uint16_t id) 1163 { 1164 if (!(info->flags & VFIO_REGION_INFO_FLAG_CAPS)) { 1165 return NULL; 1166 } 1167 1168 return vfio_get_cap((void *)info, info->cap_offset, id); 1169 } 1170 1171 static struct vfio_info_cap_header * 1172 vfio_get_iommu_type1_info_cap(struct vfio_iommu_type1_info *info, uint16_t id) 1173 { 1174 if (!(info->flags & VFIO_IOMMU_INFO_CAPS)) { 1175 return NULL; 1176 } 1177 1178 return vfio_get_cap((void *)info, info->cap_offset, id); 1179 } 1180 1181 struct vfio_info_cap_header * 1182 vfio_get_device_info_cap(struct vfio_device_info *info, uint16_t id) 1183 { 1184 if (!(info->flags & VFIO_DEVICE_FLAGS_CAPS)) { 1185 return NULL; 1186 } 1187 1188 return vfio_get_cap((void *)info, info->cap_offset, id); 1189 } 1190 1191 bool vfio_get_info_dma_avail(struct vfio_iommu_type1_info *info, 1192 unsigned int *avail) 1193 { 1194 struct vfio_info_cap_header *hdr; 1195 struct vfio_iommu_type1_info_dma_avail *cap; 1196 1197 /* If the capability cannot be found, assume no DMA limiting */ 1198 hdr = vfio_get_iommu_type1_info_cap(info, 1199 VFIO_IOMMU_TYPE1_INFO_DMA_AVAIL); 1200 if (hdr == NULL) { 1201 return false; 1202 } 1203 1204 if (avail != NULL) { 1205 cap = (void *) hdr; 1206 *avail = cap->avail; 1207 } 1208 1209 return true; 1210 } 1211 1212 static int vfio_setup_region_sparse_mmaps(VFIORegion *region, 1213 struct vfio_region_info *info) 1214 { 1215 struct vfio_info_cap_header *hdr; 1216 struct vfio_region_info_cap_sparse_mmap *sparse; 1217 int i, j; 1218 1219 hdr = vfio_get_region_info_cap(info, VFIO_REGION_INFO_CAP_SPARSE_MMAP); 1220 if (!hdr) { 1221 return -ENODEV; 1222 } 1223 1224 sparse = container_of(hdr, struct vfio_region_info_cap_sparse_mmap, header); 1225 1226 trace_vfio_region_sparse_mmap_header(region->vbasedev->name, 1227 region->nr, sparse->nr_areas); 1228 1229 region->mmaps = g_new0(VFIOMmap, sparse->nr_areas); 1230 1231 for (i = 0, j = 0; i < sparse->nr_areas; i++) { 1232 trace_vfio_region_sparse_mmap_entry(i, sparse->areas[i].offset, 1233 sparse->areas[i].offset + 1234 sparse->areas[i].size); 1235 1236 if (sparse->areas[i].size) { 1237 region->mmaps[j].offset = sparse->areas[i].offset; 1238 region->mmaps[j].size = sparse->areas[i].size; 1239 j++; 1240 } 1241 } 1242 1243 region->nr_mmaps = j; 1244 region->mmaps = g_realloc(region->mmaps, j * sizeof(VFIOMmap)); 1245 1246 return 0; 1247 } 1248 1249 int vfio_region_setup(Object *obj, VFIODevice *vbasedev, VFIORegion *region, 1250 int index, const char *name) 1251 { 1252 struct vfio_region_info *info; 1253 int ret; 1254 1255 ret = vfio_get_region_info(vbasedev, index, &info); 1256 if (ret) { 1257 return ret; 1258 } 1259 1260 region->vbasedev = vbasedev; 1261 region->flags = info->flags; 1262 region->size = info->size; 1263 region->fd_offset = info->offset; 1264 region->nr = index; 1265 1266 if (region->size) { 1267 region->mem = g_new0(MemoryRegion, 1); 1268 memory_region_init_io(region->mem, obj, &vfio_region_ops, 1269 region, name, region->size); 1270 1271 if (!vbasedev->no_mmap && 1272 region->flags & VFIO_REGION_INFO_FLAG_MMAP) { 1273 1274 ret = vfio_setup_region_sparse_mmaps(region, info); 1275 1276 if (ret) { 1277 region->nr_mmaps = 1; 1278 region->mmaps = g_new0(VFIOMmap, region->nr_mmaps); 1279 region->mmaps[0].offset = 0; 1280 region->mmaps[0].size = region->size; 1281 } 1282 } 1283 } 1284 1285 g_free(info); 1286 1287 trace_vfio_region_setup(vbasedev->name, index, name, 1288 region->flags, region->fd_offset, region->size); 1289 return 0; 1290 } 1291 1292 static void vfio_subregion_unmap(VFIORegion *region, int index) 1293 { 1294 trace_vfio_region_unmap(memory_region_name(®ion->mmaps[index].mem), 1295 region->mmaps[index].offset, 1296 region->mmaps[index].offset + 1297 region->mmaps[index].size - 1); 1298 memory_region_del_subregion(region->mem, ®ion->mmaps[index].mem); 1299 munmap(region->mmaps[index].mmap, region->mmaps[index].size); 1300 object_unparent(OBJECT(®ion->mmaps[index].mem)); 1301 region->mmaps[index].mmap = NULL; 1302 } 1303 1304 int vfio_region_mmap(VFIORegion *region) 1305 { 1306 int i, prot = 0; 1307 char *name; 1308 1309 if (!region->mem) { 1310 return 0; 1311 } 1312 1313 prot |= region->flags & VFIO_REGION_INFO_FLAG_READ ? PROT_READ : 0; 1314 prot |= region->flags & VFIO_REGION_INFO_FLAG_WRITE ? PROT_WRITE : 0; 1315 1316 for (i = 0; i < region->nr_mmaps; i++) { 1317 region->mmaps[i].mmap = mmap(NULL, region->mmaps[i].size, prot, 1318 MAP_SHARED, region->vbasedev->fd, 1319 region->fd_offset + 1320 region->mmaps[i].offset); 1321 if (region->mmaps[i].mmap == MAP_FAILED) { 1322 int ret = -errno; 1323 1324 trace_vfio_region_mmap_fault(memory_region_name(region->mem), i, 1325 region->fd_offset + 1326 region->mmaps[i].offset, 1327 region->fd_offset + 1328 region->mmaps[i].offset + 1329 region->mmaps[i].size - 1, ret); 1330 1331 region->mmaps[i].mmap = NULL; 1332 1333 for (i--; i >= 0; i--) { 1334 vfio_subregion_unmap(region, i); 1335 } 1336 1337 return ret; 1338 } 1339 1340 name = g_strdup_printf("%s mmaps[%d]", 1341 memory_region_name(region->mem), i); 1342 memory_region_init_ram_device_ptr(®ion->mmaps[i].mem, 1343 memory_region_owner(region->mem), 1344 name, region->mmaps[i].size, 1345 region->mmaps[i].mmap); 1346 g_free(name); 1347 memory_region_add_subregion(region->mem, region->mmaps[i].offset, 1348 ®ion->mmaps[i].mem); 1349 1350 trace_vfio_region_mmap(memory_region_name(®ion->mmaps[i].mem), 1351 region->mmaps[i].offset, 1352 region->mmaps[i].offset + 1353 region->mmaps[i].size - 1); 1354 } 1355 1356 return 0; 1357 } 1358 1359 void vfio_region_unmap(VFIORegion *region) 1360 { 1361 int i; 1362 1363 if (!region->mem) { 1364 return; 1365 } 1366 1367 for (i = 0; i < region->nr_mmaps; i++) { 1368 if (region->mmaps[i].mmap) { 1369 vfio_subregion_unmap(region, i); 1370 } 1371 } 1372 } 1373 1374 void vfio_region_exit(VFIORegion *region) 1375 { 1376 int i; 1377 1378 if (!region->mem) { 1379 return; 1380 } 1381 1382 for (i = 0; i < region->nr_mmaps; i++) { 1383 if (region->mmaps[i].mmap) { 1384 memory_region_del_subregion(region->mem, ®ion->mmaps[i].mem); 1385 } 1386 } 1387 1388 trace_vfio_region_exit(region->vbasedev->name, region->nr); 1389 } 1390 1391 void vfio_region_finalize(VFIORegion *region) 1392 { 1393 int i; 1394 1395 if (!region->mem) { 1396 return; 1397 } 1398 1399 for (i = 0; i < region->nr_mmaps; i++) { 1400 if (region->mmaps[i].mmap) { 1401 munmap(region->mmaps[i].mmap, region->mmaps[i].size); 1402 object_unparent(OBJECT(®ion->mmaps[i].mem)); 1403 } 1404 } 1405 1406 object_unparent(OBJECT(region->mem)); 1407 1408 g_free(region->mem); 1409 g_free(region->mmaps); 1410 1411 trace_vfio_region_finalize(region->vbasedev->name, region->nr); 1412 1413 region->mem = NULL; 1414 region->mmaps = NULL; 1415 region->nr_mmaps = 0; 1416 region->size = 0; 1417 region->flags = 0; 1418 region->nr = 0; 1419 } 1420 1421 void vfio_region_mmaps_set_enabled(VFIORegion *region, bool enabled) 1422 { 1423 int i; 1424 1425 if (!region->mem) { 1426 return; 1427 } 1428 1429 for (i = 0; i < region->nr_mmaps; i++) { 1430 if (region->mmaps[i].mmap) { 1431 memory_region_set_enabled(®ion->mmaps[i].mem, enabled); 1432 } 1433 } 1434 1435 trace_vfio_region_mmaps_set_enabled(memory_region_name(region->mem), 1436 enabled); 1437 } 1438 1439 void vfio_reset_handler(void *opaque) 1440 { 1441 VFIOGroup *group; 1442 VFIODevice *vbasedev; 1443 1444 QLIST_FOREACH(group, &vfio_group_list, next) { 1445 QLIST_FOREACH(vbasedev, &group->device_list, next) { 1446 if (vbasedev->dev->realized) { 1447 vbasedev->ops->vfio_compute_needs_reset(vbasedev); 1448 } 1449 } 1450 } 1451 1452 QLIST_FOREACH(group, &vfio_group_list, next) { 1453 QLIST_FOREACH(vbasedev, &group->device_list, next) { 1454 if (vbasedev->dev->realized && vbasedev->needs_reset) { 1455 vbasedev->ops->vfio_hot_reset_multi(vbasedev); 1456 } 1457 } 1458 } 1459 } 1460 1461 static void vfio_kvm_device_add_group(VFIOGroup *group) 1462 { 1463 #ifdef CONFIG_KVM 1464 struct kvm_device_attr attr = { 1465 .group = KVM_DEV_VFIO_GROUP, 1466 .attr = KVM_DEV_VFIO_GROUP_ADD, 1467 .addr = (uint64_t)(unsigned long)&group->fd, 1468 }; 1469 1470 if (!kvm_enabled()) { 1471 return; 1472 } 1473 1474 if (vfio_kvm_device_fd < 0) { 1475 struct kvm_create_device cd = { 1476 .type = KVM_DEV_TYPE_VFIO, 1477 }; 1478 1479 if (kvm_vm_ioctl(kvm_state, KVM_CREATE_DEVICE, &cd)) { 1480 error_report("Failed to create KVM VFIO device: %m"); 1481 return; 1482 } 1483 1484 vfio_kvm_device_fd = cd.fd; 1485 } 1486 1487 if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) { 1488 error_report("Failed to add group %d to KVM VFIO device: %m", 1489 group->groupid); 1490 } 1491 #endif 1492 } 1493 1494 static void vfio_kvm_device_del_group(VFIOGroup *group) 1495 { 1496 #ifdef CONFIG_KVM 1497 struct kvm_device_attr attr = { 1498 .group = KVM_DEV_VFIO_GROUP, 1499 .attr = KVM_DEV_VFIO_GROUP_DEL, 1500 .addr = (uint64_t)(unsigned long)&group->fd, 1501 }; 1502 1503 if (vfio_kvm_device_fd < 0) { 1504 return; 1505 } 1506 1507 if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) { 1508 error_report("Failed to remove group %d from KVM VFIO device: %m", 1509 group->groupid); 1510 } 1511 #endif 1512 } 1513 1514 static VFIOAddressSpace *vfio_get_address_space(AddressSpace *as) 1515 { 1516 VFIOAddressSpace *space; 1517 1518 QLIST_FOREACH(space, &vfio_address_spaces, list) { 1519 if (space->as == as) { 1520 return space; 1521 } 1522 } 1523 1524 /* No suitable VFIOAddressSpace, create a new one */ 1525 space = g_malloc0(sizeof(*space)); 1526 space->as = as; 1527 QLIST_INIT(&space->containers); 1528 1529 QLIST_INSERT_HEAD(&vfio_address_spaces, space, list); 1530 1531 return space; 1532 } 1533 1534 static void vfio_put_address_space(VFIOAddressSpace *space) 1535 { 1536 if (QLIST_EMPTY(&space->containers)) { 1537 QLIST_REMOVE(space, list); 1538 g_free(space); 1539 } 1540 } 1541 1542 /* 1543 * vfio_get_iommu_type - selects the richest iommu_type (v2 first) 1544 */ 1545 static int vfio_get_iommu_type(VFIOContainer *container, 1546 Error **errp) 1547 { 1548 int iommu_types[] = { VFIO_TYPE1v2_IOMMU, VFIO_TYPE1_IOMMU, 1549 VFIO_SPAPR_TCE_v2_IOMMU, VFIO_SPAPR_TCE_IOMMU }; 1550 int i; 1551 1552 for (i = 0; i < ARRAY_SIZE(iommu_types); i++) { 1553 if (ioctl(container->fd, VFIO_CHECK_EXTENSION, iommu_types[i])) { 1554 return iommu_types[i]; 1555 } 1556 } 1557 error_setg(errp, "No available IOMMU models"); 1558 return -EINVAL; 1559 } 1560 1561 static int vfio_init_container(VFIOContainer *container, int group_fd, 1562 Error **errp) 1563 { 1564 int iommu_type, ret; 1565 1566 iommu_type = vfio_get_iommu_type(container, errp); 1567 if (iommu_type < 0) { 1568 return iommu_type; 1569 } 1570 1571 ret = ioctl(group_fd, VFIO_GROUP_SET_CONTAINER, &container->fd); 1572 if (ret) { 1573 error_setg_errno(errp, errno, "Failed to set group container"); 1574 return -errno; 1575 } 1576 1577 while (ioctl(container->fd, VFIO_SET_IOMMU, iommu_type)) { 1578 if (iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) { 1579 /* 1580 * On sPAPR, despite the IOMMU subdriver always advertises v1 and 1581 * v2, the running platform may not support v2 and there is no 1582 * way to guess it until an IOMMU group gets added to the container. 1583 * So in case it fails with v2, try v1 as a fallback. 1584 */ 1585 iommu_type = VFIO_SPAPR_TCE_IOMMU; 1586 continue; 1587 } 1588 error_setg_errno(errp, errno, "Failed to set iommu for container"); 1589 return -errno; 1590 } 1591 1592 container->iommu_type = iommu_type; 1593 return 0; 1594 } 1595 1596 static int vfio_get_iommu_info(VFIOContainer *container, 1597 struct vfio_iommu_type1_info **info) 1598 { 1599 1600 size_t argsz = sizeof(struct vfio_iommu_type1_info); 1601 1602 *info = g_new0(struct vfio_iommu_type1_info, 1); 1603 again: 1604 (*info)->argsz = argsz; 1605 1606 if (ioctl(container->fd, VFIO_IOMMU_GET_INFO, *info)) { 1607 g_free(*info); 1608 *info = NULL; 1609 return -errno; 1610 } 1611 1612 if (((*info)->argsz > argsz)) { 1613 argsz = (*info)->argsz; 1614 *info = g_realloc(*info, argsz); 1615 goto again; 1616 } 1617 1618 return 0; 1619 } 1620 1621 static struct vfio_info_cap_header * 1622 vfio_get_iommu_info_cap(struct vfio_iommu_type1_info *info, uint16_t id) 1623 { 1624 struct vfio_info_cap_header *hdr; 1625 void *ptr = info; 1626 1627 if (!(info->flags & VFIO_IOMMU_INFO_CAPS)) { 1628 return NULL; 1629 } 1630 1631 for (hdr = ptr + info->cap_offset; hdr != ptr; hdr = ptr + hdr->next) { 1632 if (hdr->id == id) { 1633 return hdr; 1634 } 1635 } 1636 1637 return NULL; 1638 } 1639 1640 static void vfio_get_iommu_info_migration(VFIOContainer *container, 1641 struct vfio_iommu_type1_info *info) 1642 { 1643 struct vfio_info_cap_header *hdr; 1644 struct vfio_iommu_type1_info_cap_migration *cap_mig; 1645 1646 hdr = vfio_get_iommu_info_cap(info, VFIO_IOMMU_TYPE1_INFO_CAP_MIGRATION); 1647 if (!hdr) { 1648 return; 1649 } 1650 1651 cap_mig = container_of(hdr, struct vfio_iommu_type1_info_cap_migration, 1652 header); 1653 1654 /* 1655 * cpu_physical_memory_set_dirty_lebitmap() expects pages in bitmap of 1656 * TARGET_PAGE_SIZE to mark those dirty. 1657 */ 1658 if (cap_mig->pgsize_bitmap & TARGET_PAGE_SIZE) { 1659 container->dirty_pages_supported = true; 1660 container->max_dirty_bitmap_size = cap_mig->max_dirty_bitmap_size; 1661 container->dirty_pgsizes = cap_mig->pgsize_bitmap; 1662 } 1663 } 1664 1665 static int vfio_connect_container(VFIOGroup *group, AddressSpace *as, 1666 Error **errp) 1667 { 1668 VFIOContainer *container; 1669 int ret, fd; 1670 VFIOAddressSpace *space; 1671 1672 space = vfio_get_address_space(as); 1673 1674 /* 1675 * VFIO is currently incompatible with discarding of RAM insofar as the 1676 * madvise to purge (zap) the page from QEMU's address space does not 1677 * interact with the memory API and therefore leaves stale virtual to 1678 * physical mappings in the IOMMU if the page was previously pinned. We 1679 * therefore set discarding broken for each group added to a container, 1680 * whether the container is used individually or shared. This provides 1681 * us with options to allow devices within a group to opt-in and allow 1682 * discarding, so long as it is done consistently for a group (for instance 1683 * if the device is an mdev device where it is known that the host vendor 1684 * driver will never pin pages outside of the working set of the guest 1685 * driver, which would thus not be discarding candidates). 1686 * 1687 * The first opportunity to induce pinning occurs here where we attempt to 1688 * attach the group to existing containers within the AddressSpace. If any 1689 * pages are already zapped from the virtual address space, such as from 1690 * previous discards, new pinning will cause valid mappings to be 1691 * re-established. Likewise, when the overall MemoryListener for a new 1692 * container is registered, a replay of mappings within the AddressSpace 1693 * will occur, re-establishing any previously zapped pages as well. 1694 * 1695 * Especially virtio-balloon is currently only prevented from discarding 1696 * new memory, it will not yet set ram_block_discard_set_required() and 1697 * therefore, neither stops us here or deals with the sudden memory 1698 * consumption of inflated memory. 1699 */ 1700 ret = ram_block_discard_disable(true); 1701 if (ret) { 1702 error_setg_errno(errp, -ret, "Cannot set discarding of RAM broken"); 1703 return ret; 1704 } 1705 1706 QLIST_FOREACH(container, &space->containers, next) { 1707 if (!ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &container->fd)) { 1708 group->container = container; 1709 QLIST_INSERT_HEAD(&container->group_list, group, container_next); 1710 vfio_kvm_device_add_group(group); 1711 return 0; 1712 } 1713 } 1714 1715 fd = qemu_open_old("/dev/vfio/vfio", O_RDWR); 1716 if (fd < 0) { 1717 error_setg_errno(errp, errno, "failed to open /dev/vfio/vfio"); 1718 ret = -errno; 1719 goto put_space_exit; 1720 } 1721 1722 ret = ioctl(fd, VFIO_GET_API_VERSION); 1723 if (ret != VFIO_API_VERSION) { 1724 error_setg(errp, "supported vfio version: %d, " 1725 "reported version: %d", VFIO_API_VERSION, ret); 1726 ret = -EINVAL; 1727 goto close_fd_exit; 1728 } 1729 1730 container = g_malloc0(sizeof(*container)); 1731 container->space = space; 1732 container->fd = fd; 1733 container->error = NULL; 1734 container->dirty_pages_supported = false; 1735 QLIST_INIT(&container->giommu_list); 1736 QLIST_INIT(&container->hostwin_list); 1737 1738 ret = vfio_init_container(container, group->fd, errp); 1739 if (ret) { 1740 goto free_container_exit; 1741 } 1742 1743 switch (container->iommu_type) { 1744 case VFIO_TYPE1v2_IOMMU: 1745 case VFIO_TYPE1_IOMMU: 1746 { 1747 struct vfio_iommu_type1_info *info; 1748 1749 /* 1750 * FIXME: This assumes that a Type1 IOMMU can map any 64-bit 1751 * IOVA whatsoever. That's not actually true, but the current 1752 * kernel interface doesn't tell us what it can map, and the 1753 * existing Type1 IOMMUs generally support any IOVA we're 1754 * going to actually try in practice. 1755 */ 1756 ret = vfio_get_iommu_info(container, &info); 1757 1758 if (ret || !(info->flags & VFIO_IOMMU_INFO_PGSIZES)) { 1759 /* Assume 4k IOVA page size */ 1760 info->iova_pgsizes = 4096; 1761 } 1762 vfio_host_win_add(container, 0, (hwaddr)-1, info->iova_pgsizes); 1763 container->pgsizes = info->iova_pgsizes; 1764 1765 if (!ret) { 1766 vfio_get_iommu_info_migration(container, info); 1767 } 1768 g_free(info); 1769 break; 1770 } 1771 case VFIO_SPAPR_TCE_v2_IOMMU: 1772 case VFIO_SPAPR_TCE_IOMMU: 1773 { 1774 struct vfio_iommu_spapr_tce_info info; 1775 bool v2 = container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU; 1776 1777 /* 1778 * The host kernel code implementing VFIO_IOMMU_DISABLE is called 1779 * when container fd is closed so we do not call it explicitly 1780 * in this file. 1781 */ 1782 if (!v2) { 1783 ret = ioctl(fd, VFIO_IOMMU_ENABLE); 1784 if (ret) { 1785 error_setg_errno(errp, errno, "failed to enable container"); 1786 ret = -errno; 1787 goto free_container_exit; 1788 } 1789 } else { 1790 container->prereg_listener = vfio_prereg_listener; 1791 1792 memory_listener_register(&container->prereg_listener, 1793 &address_space_memory); 1794 if (container->error) { 1795 memory_listener_unregister(&container->prereg_listener); 1796 ret = -1; 1797 error_propagate_prepend(errp, container->error, 1798 "RAM memory listener initialization failed: "); 1799 goto free_container_exit; 1800 } 1801 } 1802 1803 info.argsz = sizeof(info); 1804 ret = ioctl(fd, VFIO_IOMMU_SPAPR_TCE_GET_INFO, &info); 1805 if (ret) { 1806 error_setg_errno(errp, errno, 1807 "VFIO_IOMMU_SPAPR_TCE_GET_INFO failed"); 1808 ret = -errno; 1809 if (v2) { 1810 memory_listener_unregister(&container->prereg_listener); 1811 } 1812 goto free_container_exit; 1813 } 1814 1815 if (v2) { 1816 container->pgsizes = info.ddw.pgsizes; 1817 /* 1818 * There is a default window in just created container. 1819 * To make region_add/del simpler, we better remove this 1820 * window now and let those iommu_listener callbacks 1821 * create/remove them when needed. 1822 */ 1823 ret = vfio_spapr_remove_window(container, info.dma32_window_start); 1824 if (ret) { 1825 error_setg_errno(errp, -ret, 1826 "failed to remove existing window"); 1827 goto free_container_exit; 1828 } 1829 } else { 1830 /* The default table uses 4K pages */ 1831 container->pgsizes = 0x1000; 1832 vfio_host_win_add(container, info.dma32_window_start, 1833 info.dma32_window_start + 1834 info.dma32_window_size - 1, 1835 0x1000); 1836 } 1837 } 1838 } 1839 1840 vfio_kvm_device_add_group(group); 1841 1842 QLIST_INIT(&container->group_list); 1843 QLIST_INSERT_HEAD(&space->containers, container, next); 1844 1845 group->container = container; 1846 QLIST_INSERT_HEAD(&container->group_list, group, container_next); 1847 1848 container->listener = vfio_memory_listener; 1849 1850 memory_listener_register(&container->listener, container->space->as); 1851 1852 if (container->error) { 1853 ret = -1; 1854 error_propagate_prepend(errp, container->error, 1855 "memory listener initialization failed: "); 1856 goto listener_release_exit; 1857 } 1858 1859 container->initialized = true; 1860 1861 return 0; 1862 listener_release_exit: 1863 QLIST_REMOVE(group, container_next); 1864 QLIST_REMOVE(container, next); 1865 vfio_kvm_device_del_group(group); 1866 vfio_listener_release(container); 1867 1868 free_container_exit: 1869 g_free(container); 1870 1871 close_fd_exit: 1872 close(fd); 1873 1874 put_space_exit: 1875 ram_block_discard_disable(false); 1876 vfio_put_address_space(space); 1877 1878 return ret; 1879 } 1880 1881 static void vfio_disconnect_container(VFIOGroup *group) 1882 { 1883 VFIOContainer *container = group->container; 1884 1885 QLIST_REMOVE(group, container_next); 1886 group->container = NULL; 1887 1888 /* 1889 * Explicitly release the listener first before unset container, 1890 * since unset may destroy the backend container if it's the last 1891 * group. 1892 */ 1893 if (QLIST_EMPTY(&container->group_list)) { 1894 vfio_listener_release(container); 1895 } 1896 1897 if (ioctl(group->fd, VFIO_GROUP_UNSET_CONTAINER, &container->fd)) { 1898 error_report("vfio: error disconnecting group %d from container", 1899 group->groupid); 1900 } 1901 1902 if (QLIST_EMPTY(&container->group_list)) { 1903 VFIOAddressSpace *space = container->space; 1904 VFIOGuestIOMMU *giommu, *tmp; 1905 1906 QLIST_REMOVE(container, next); 1907 1908 QLIST_FOREACH_SAFE(giommu, &container->giommu_list, giommu_next, tmp) { 1909 memory_region_unregister_iommu_notifier( 1910 MEMORY_REGION(giommu->iommu), &giommu->n); 1911 QLIST_REMOVE(giommu, giommu_next); 1912 g_free(giommu); 1913 } 1914 1915 trace_vfio_disconnect_container(container->fd); 1916 close(container->fd); 1917 g_free(container); 1918 1919 vfio_put_address_space(space); 1920 } 1921 } 1922 1923 VFIOGroup *vfio_get_group(int groupid, AddressSpace *as, Error **errp) 1924 { 1925 VFIOGroup *group; 1926 char path[32]; 1927 struct vfio_group_status status = { .argsz = sizeof(status) }; 1928 1929 QLIST_FOREACH(group, &vfio_group_list, next) { 1930 if (group->groupid == groupid) { 1931 /* Found it. Now is it already in the right context? */ 1932 if (group->container->space->as == as) { 1933 return group; 1934 } else { 1935 error_setg(errp, "group %d used in multiple address spaces", 1936 group->groupid); 1937 return NULL; 1938 } 1939 } 1940 } 1941 1942 group = g_malloc0(sizeof(*group)); 1943 1944 snprintf(path, sizeof(path), "/dev/vfio/%d", groupid); 1945 group->fd = qemu_open_old(path, O_RDWR); 1946 if (group->fd < 0) { 1947 error_setg_errno(errp, errno, "failed to open %s", path); 1948 goto free_group_exit; 1949 } 1950 1951 if (ioctl(group->fd, VFIO_GROUP_GET_STATUS, &status)) { 1952 error_setg_errno(errp, errno, "failed to get group %d status", groupid); 1953 goto close_fd_exit; 1954 } 1955 1956 if (!(status.flags & VFIO_GROUP_FLAGS_VIABLE)) { 1957 error_setg(errp, "group %d is not viable", groupid); 1958 error_append_hint(errp, 1959 "Please ensure all devices within the iommu_group " 1960 "are bound to their vfio bus driver.\n"); 1961 goto close_fd_exit; 1962 } 1963 1964 group->groupid = groupid; 1965 QLIST_INIT(&group->device_list); 1966 1967 if (vfio_connect_container(group, as, errp)) { 1968 error_prepend(errp, "failed to setup container for group %d: ", 1969 groupid); 1970 goto close_fd_exit; 1971 } 1972 1973 if (QLIST_EMPTY(&vfio_group_list)) { 1974 qemu_register_reset(vfio_reset_handler, NULL); 1975 } 1976 1977 QLIST_INSERT_HEAD(&vfio_group_list, group, next); 1978 1979 return group; 1980 1981 close_fd_exit: 1982 close(group->fd); 1983 1984 free_group_exit: 1985 g_free(group); 1986 1987 return NULL; 1988 } 1989 1990 void vfio_put_group(VFIOGroup *group) 1991 { 1992 if (!group || !QLIST_EMPTY(&group->device_list)) { 1993 return; 1994 } 1995 1996 if (!group->ram_block_discard_allowed) { 1997 ram_block_discard_disable(false); 1998 } 1999 vfio_kvm_device_del_group(group); 2000 vfio_disconnect_container(group); 2001 QLIST_REMOVE(group, next); 2002 trace_vfio_put_group(group->fd); 2003 close(group->fd); 2004 g_free(group); 2005 2006 if (QLIST_EMPTY(&vfio_group_list)) { 2007 qemu_unregister_reset(vfio_reset_handler, NULL); 2008 } 2009 } 2010 2011 int vfio_get_device(VFIOGroup *group, const char *name, 2012 VFIODevice *vbasedev, Error **errp) 2013 { 2014 struct vfio_device_info dev_info = { .argsz = sizeof(dev_info) }; 2015 int ret, fd; 2016 2017 fd = ioctl(group->fd, VFIO_GROUP_GET_DEVICE_FD, name); 2018 if (fd < 0) { 2019 error_setg_errno(errp, errno, "error getting device from group %d", 2020 group->groupid); 2021 error_append_hint(errp, 2022 "Verify all devices in group %d are bound to vfio-<bus> " 2023 "or pci-stub and not already in use\n", group->groupid); 2024 return fd; 2025 } 2026 2027 ret = ioctl(fd, VFIO_DEVICE_GET_INFO, &dev_info); 2028 if (ret) { 2029 error_setg_errno(errp, errno, "error getting device info"); 2030 close(fd); 2031 return ret; 2032 } 2033 2034 /* 2035 * Set discarding of RAM as not broken for this group if the driver knows 2036 * the device operates compatibly with discarding. Setting must be 2037 * consistent per group, but since compatibility is really only possible 2038 * with mdev currently, we expect singleton groups. 2039 */ 2040 if (vbasedev->ram_block_discard_allowed != 2041 group->ram_block_discard_allowed) { 2042 if (!QLIST_EMPTY(&group->device_list)) { 2043 error_setg(errp, "Inconsistent setting of support for discarding " 2044 "RAM (e.g., balloon) within group"); 2045 close(fd); 2046 return -1; 2047 } 2048 2049 if (!group->ram_block_discard_allowed) { 2050 group->ram_block_discard_allowed = true; 2051 ram_block_discard_disable(false); 2052 } 2053 } 2054 2055 vbasedev->fd = fd; 2056 vbasedev->group = group; 2057 QLIST_INSERT_HEAD(&group->device_list, vbasedev, next); 2058 2059 vbasedev->num_irqs = dev_info.num_irqs; 2060 vbasedev->num_regions = dev_info.num_regions; 2061 vbasedev->flags = dev_info.flags; 2062 2063 trace_vfio_get_device(name, dev_info.flags, dev_info.num_regions, 2064 dev_info.num_irqs); 2065 2066 vbasedev->reset_works = !!(dev_info.flags & VFIO_DEVICE_FLAGS_RESET); 2067 return 0; 2068 } 2069 2070 void vfio_put_base_device(VFIODevice *vbasedev) 2071 { 2072 if (!vbasedev->group) { 2073 return; 2074 } 2075 QLIST_REMOVE(vbasedev, next); 2076 vbasedev->group = NULL; 2077 trace_vfio_put_base_device(vbasedev->fd); 2078 close(vbasedev->fd); 2079 } 2080 2081 int vfio_get_region_info(VFIODevice *vbasedev, int index, 2082 struct vfio_region_info **info) 2083 { 2084 size_t argsz = sizeof(struct vfio_region_info); 2085 2086 *info = g_malloc0(argsz); 2087 2088 (*info)->index = index; 2089 retry: 2090 (*info)->argsz = argsz; 2091 2092 if (ioctl(vbasedev->fd, VFIO_DEVICE_GET_REGION_INFO, *info)) { 2093 g_free(*info); 2094 *info = NULL; 2095 return -errno; 2096 } 2097 2098 if ((*info)->argsz > argsz) { 2099 argsz = (*info)->argsz; 2100 *info = g_realloc(*info, argsz); 2101 2102 goto retry; 2103 } 2104 2105 return 0; 2106 } 2107 2108 int vfio_get_dev_region_info(VFIODevice *vbasedev, uint32_t type, 2109 uint32_t subtype, struct vfio_region_info **info) 2110 { 2111 int i; 2112 2113 for (i = 0; i < vbasedev->num_regions; i++) { 2114 struct vfio_info_cap_header *hdr; 2115 struct vfio_region_info_cap_type *cap_type; 2116 2117 if (vfio_get_region_info(vbasedev, i, info)) { 2118 continue; 2119 } 2120 2121 hdr = vfio_get_region_info_cap(*info, VFIO_REGION_INFO_CAP_TYPE); 2122 if (!hdr) { 2123 g_free(*info); 2124 continue; 2125 } 2126 2127 cap_type = container_of(hdr, struct vfio_region_info_cap_type, header); 2128 2129 trace_vfio_get_dev_region(vbasedev->name, i, 2130 cap_type->type, cap_type->subtype); 2131 2132 if (cap_type->type == type && cap_type->subtype == subtype) { 2133 return 0; 2134 } 2135 2136 g_free(*info); 2137 } 2138 2139 *info = NULL; 2140 return -ENODEV; 2141 } 2142 2143 bool vfio_has_region_cap(VFIODevice *vbasedev, int region, uint16_t cap_type) 2144 { 2145 struct vfio_region_info *info = NULL; 2146 bool ret = false; 2147 2148 if (!vfio_get_region_info(vbasedev, region, &info)) { 2149 if (vfio_get_region_info_cap(info, cap_type)) { 2150 ret = true; 2151 } 2152 g_free(info); 2153 } 2154 2155 return ret; 2156 } 2157 2158 /* 2159 * Interfaces for IBM EEH (Enhanced Error Handling) 2160 */ 2161 static bool vfio_eeh_container_ok(VFIOContainer *container) 2162 { 2163 /* 2164 * As of 2016-03-04 (linux-4.5) the host kernel EEH/VFIO 2165 * implementation is broken if there are multiple groups in a 2166 * container. The hardware works in units of Partitionable 2167 * Endpoints (== IOMMU groups) and the EEH operations naively 2168 * iterate across all groups in the container, without any logic 2169 * to make sure the groups have their state synchronized. For 2170 * certain operations (ENABLE) that might be ok, until an error 2171 * occurs, but for others (GET_STATE) it's clearly broken. 2172 */ 2173 2174 /* 2175 * XXX Once fixed kernels exist, test for them here 2176 */ 2177 2178 if (QLIST_EMPTY(&container->group_list)) { 2179 return false; 2180 } 2181 2182 if (QLIST_NEXT(QLIST_FIRST(&container->group_list), container_next)) { 2183 return false; 2184 } 2185 2186 return true; 2187 } 2188 2189 static int vfio_eeh_container_op(VFIOContainer *container, uint32_t op) 2190 { 2191 struct vfio_eeh_pe_op pe_op = { 2192 .argsz = sizeof(pe_op), 2193 .op = op, 2194 }; 2195 int ret; 2196 2197 if (!vfio_eeh_container_ok(container)) { 2198 error_report("vfio/eeh: EEH_PE_OP 0x%x: " 2199 "kernel requires a container with exactly one group", op); 2200 return -EPERM; 2201 } 2202 2203 ret = ioctl(container->fd, VFIO_EEH_PE_OP, &pe_op); 2204 if (ret < 0) { 2205 error_report("vfio/eeh: EEH_PE_OP 0x%x failed: %m", op); 2206 return -errno; 2207 } 2208 2209 return ret; 2210 } 2211 2212 static VFIOContainer *vfio_eeh_as_container(AddressSpace *as) 2213 { 2214 VFIOAddressSpace *space = vfio_get_address_space(as); 2215 VFIOContainer *container = NULL; 2216 2217 if (QLIST_EMPTY(&space->containers)) { 2218 /* No containers to act on */ 2219 goto out; 2220 } 2221 2222 container = QLIST_FIRST(&space->containers); 2223 2224 if (QLIST_NEXT(container, next)) { 2225 /* We don't yet have logic to synchronize EEH state across 2226 * multiple containers */ 2227 container = NULL; 2228 goto out; 2229 } 2230 2231 out: 2232 vfio_put_address_space(space); 2233 return container; 2234 } 2235 2236 bool vfio_eeh_as_ok(AddressSpace *as) 2237 { 2238 VFIOContainer *container = vfio_eeh_as_container(as); 2239 2240 return (container != NULL) && vfio_eeh_container_ok(container); 2241 } 2242 2243 int vfio_eeh_as_op(AddressSpace *as, uint32_t op) 2244 { 2245 VFIOContainer *container = vfio_eeh_as_container(as); 2246 2247 if (!container) { 2248 return -ENODEV; 2249 } 2250 return vfio_eeh_container_op(container, op); 2251 } 2252